Malicious PDF — malware analysis report

Static analysis result for SHA-256 18cb76eca97c6ae7…

MALICIOUS

PDF

79.6 KB Created: 2021-03-14 03:57:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: dc5e1c9f60d3a6c8466f90a5bc647230 SHA-1: 9f00d6c5b443cfedf36037ac8e4d6e0c0965b176 SHA-256: 18cb76eca97c6ae7c14c8c94561585cabb4a4b4826209b4ac384f73674f1e1a7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. It contains numerous external URIs, with a high concentration of links on disposable hosting, suggesting a link farm or redirection mechanism. The embedded URLs and the PDF structure indicate an attempt to direct the user to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://vilenefex.ru/award?keyword=aocs+official+method+cd+11b+91+pdf PDF link annotation
    • https://cdn.sqhk.co/rivotoxupow/Zje7Sha/nfs_heat_studio_apk_download_mod.pdfIn PDF document text
    • http://kedepoba.sportsontheweb.net/kemolegedevenegodarivim.pdfIn PDF document text
    • http://pedazejor.iblogger.org/66040946249.pdfIn PDF document text
    • https://nukanomipixi.weebly.com/uploads/1/3/2/7/132740264/ninepimar.pdfIn PDF document text
    • http://doxugivo.22web.org/excel_2007_worksheet_greyed_out.pdfIn PDF document text
    • https://nuruvubapifak.weebly.com/uploads/1/3/1/4/131452890/ca323bc20cc.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/jKgfhfq/magic_piano_mod_apk_ios.pdfIn PDF document text
    • http://kufafukedexepix.mygamesonline.org/nozodufebixej.pdfIn PDF document text
    • http://niwujobexev.22web.org/53785953757.pdfIn PDF document text
    • https://kedaweva.weebly.com/uploads/1/3/4/8/134895813/vopazugugile.pdfIn PDF document text
    • http://hurleyshamburgers.com/champions_league_intro_music17ar0.pdfIn PDF document text
    • http://com-servers.online/rocketbook_panda_planner_pagesr4e06.pdfIn PDF document text
    • https://cdn.sqhk.co/maxevurux/gevjThj/original_star_wars_cast_episode_2.pdfIn PDF document text
    • http://ganedoxumizaj.sportsontheweb.net/81103973218.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gagarereforer.epizy.com/49182731360.pdfIn PDF document text
    • http://vakogez.myartsonline.com/reasoning_ability_questions_and_answers_with_explanation.pdfIn PDF document text
    • http://taperimogitunal.epizy.com/python_add_text_box_to.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/meditaciones_marco_aurelio_libro_1.pdfIn PDF document text
    • http://bileperiwuxi.epizy.com/rainbow_fish_book_story.pdfIn PDF document text
    • http://desukavogoviz.epizy.com/31658890791.pdfIn PDF document text
    • http://pogixade.rf.gd/no_game_no_life_shiro_x_sora_lemon.pdfIn PDF document text
    • http://sagisat.rf.gd/73433775840.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7D8 5636 bytes
SHA-256: b2c4daa2af6008c87e2965aa3503150701a3a8a507ecd0f139667d10185c01c9
font_01_sfnt_off00010ae6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AE6 10744 bytes
SHA-256: c5511053d5137a8f3bb6909fdfe0bca4120a46f8398425ec79a014f97d61ce71

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